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Stockholders' Equity - Narrative (Details) - USD ($) |  | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Apr. 07, 2021 | Feb. 28, 2021 | Jan. 31, 2021 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2018 | Dec. 31, 2012 | Aug. 14, 2020 | Jul. 15, 2020
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |
Common stock, shares authorized (in shares) |  |  |  | 1,000,000,000 | 1,000,000,000 |  |  |  |
Common stock, par value (in dollars per share) |  |  |  | $ 0.0001 | $ 0.0001 |  |  |  |
Common stock, shares issued (in shares) |  |  |  | 96,751,610 | 56,371,207 |  |  |  |
Common stock, shares outstanding (in shares) |  |  |  | 96,751,610 | 56,371,207 |  |  |  |
Proceeds from sales of common stock, net of issuance costs |  |  |  | $ 94,737,000 | $ 9,177,000 |  |  |  |
Proceeds from warrant exercises |  |  |  | $ 4,635,000 | $ 0 |  |  |  |
Number of warrants (in shares) |  |  |  | 5,636,801 | 5,996,112 |  |  |  |
Warrants |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |
Proceeds from warrant exercises |  |  |  | $ 4,635,000 |  |  |  |  |
Exercise price per share (in dollars per share) |  |  |  |  |  | $ 9.22 | $ 5.54 |  |
Warrant to purchase aggregate shares of common stock (in shares) |  |  |  |  |  | 1,085,059 | 14,866 |  |
Number of warrants (in shares) |  | 3,840,000 |  |  |  |  |  |  | 2,160,000
Number of times the exercise price (as a percent) |  |  |  |  |  |  | 300.00% |  |
Warrants | Common Stock |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |
Conversion of stock, shares issued (in shares) |  |  |  | 2,060,000 |  |  |  |  |
Exercise price per share (in dollars per share) |  | $ 2.25 |  | $ 2.25 |  |  |  |  | $ 4.00
Underwritten Offering |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |
Proceeds from sales of common stock, net of issuance costs |  | $ 24,722,000 |  |  |  |  |  |  |
Payments of stock offering costs |  | 1,740,000 |  |  |  |  |  |  |
Additional transaction costs |  | $ 75,000 |  |  |  |  |  |  |
Underwritten Offering | Common Stock |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |
Sale of common stock, net of issuance costs (in shares) |  | 11,761,111 |  |  |  |  |  |  |
Common stock exercise price (in dollars per share) |  | $ 2.25 |  |  |  |  |  |  |
At Market Issuance Sales Agreement |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |
Payments of stock offering costs |  |  |  | $ 2,017,000 |  |  |  |  |
Additional transaction costs |  |  |  | 178,000 |  |  |  |  |
Gross proceeds of sales price per share (as a percent) | 3.00% |  |  |  |  |  |  |  |
Aggregate net proceeds received |  |  |  | $ 65,210,000 |  |  |  |  |
Public Warrants | Warrants |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |
Exercise price per share (in dollars per share) |  |  |  | $ 0.01 |  |  |  |  |
Last sale price of shares of common stock (exceeds, in dollars per share) |  |  |  | $ 21.00 |  |  |  |  |
Number of days within 30-trading day period |  |  |  | 20 days |  |  |  |  |
Trading day period |  |  |  | 30 days |  |  |  |  |
Private Placement | Warrants |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |
Exercise price per share (in dollars per share) |  |  |  | $ 11.50 |  |  |  |  |
Minimum number of days written notice to redeem Public Warrants |  |  |  | 30 days |  |  |  |  |
Sales Agreement |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |
Aggregate offering price |  |  |  |  |  |  |  | $ 15,000,000 |
At-The-Market Offering |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |
Proceeds from sales of common stock, net of issuance costs |  |  | $ 5,058,000 |  |  |  |  |  |
Payments of stock offering costs |  |  | $ 156,000 |  |  |  |  |  |
At-The-Market Offering | Common Stock |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |
Sale of common stock, net of issuance costs (in shares) |  |  | 2,670,121 |  |  |  |  |  |
Common Stock |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |
Sale of common stock, net of issuance costs (in shares) |  |  |  | 35,383,000 | 11,629,160 |  |  |  |
Proceeds from sales of common stock, net of issuance costs |  |  |  |  | $ 9,578,000 |  |  |  |
Payments of stock offering costs |  |  |  | $ 401,000 |  |  |  |  |
Common Stock | At Market Issuance Sales Agreement |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |
Sale of common stock, net of issuance costs (in shares) |  |  |  | 20,951,043 |  |  |  |  |
PhunCoin Warrant |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |
Exercise price per share (in dollars per share) |  |  |  | $ 11.50 |  |  |  |  |

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